#!/bin/bash
# I use an "Admin" profile in lots of my accounts that has full Admin privileges
# so my profiles in my .aws/config file are named like AAdmin, BAdmin, CAdmin, etc.
PROFILES="AAdmin BAdmin CAdmin"

# use ec2 describe-regions to get the official, up-to-the-minute region list.
for profile in $PROFILES
do
    REGIONS=$(aws ec2 describe-regions | jq -r '.Regions[].RegionName')
    echo -n "${profile}: "
    for region in $REGIONS
    do
      aws ec2 --profile "${profile}" --region ${region} \
        modify-id-format --resource all-current --use-long-ids
      echo -n "${region} "
    done
    echo "."
done